wince窗口 屏幕拷贝为位图

wince窗口 屏幕拷贝为位图
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WINCE应用层开发经验（附代码）2011-03-17 11:24559人阅读评论(0)收藏举报
wincenullcolorsbifiledelete

#define PW_WINDOW 9001

#define PW_CLIENT 9002

HBITMAP CMyProgramDlg::CopyScreenToBitmap(LPRECT lpRect)

{

HDC hScrDC, hMemDC; // screen DC and memory DC

int nX, nY, nX2, nY2; // coordinates of rectangle to grab

int nWidth, nHeight; // DIB width and height

int xScrn, yScrn; // screen resolution

HGDIOBJ hOldBitmap , hBitmap;

// check for an empty rectangle

if (IsRectEmpty(lpRect))

return NULL;

// create a DC for the screen and create

// a memory DC compatible to screen DC

hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);

hMemDC = CreateCompatibleDC(hScrDC); // get points of rectangle to grab

nX = lpRect->left;

nY = lpRect->top;

nX2 = lpRect->right;

nY2 = lpRect->bottom; // get screen resolution

xScrn = GetDeviceCaps(hScrDC, HORZRES);

yScrn = GetDeviceCaps(hScrDC, VERTRES);

//make sure bitmap rectangle is visible

if (nX < 0)

nX = 0;

if (nY < 0)

nY = 0;

if (nX2 > xScrn)

nX2 = xScrn;

if (nY2 > yScrn)

nY2 = yScrn;

nWidth = nX2 - nX;

nHeight = nY2 - nY;

// create a bitmap compatible with the screen DC

hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

// select new bitmap into memory DC

hOldBitmap = SelectObject (hMemDC, hBitmap);

// bitblt screen DC to memory DC

BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);

// select old bitmap back into memory DC and get handle to

// bitmap of the screen

hBitmap = SelectObject(hMemDC, hOldBitmap);

// clean up

DeleteDC(hScrDC);

DeleteDC(hMemDC);

// return handle to the bitmap

return (HBITMAP)hBitmap;

}

HBITMAP CYourProgramDlg::CopyWindowToBitmap(CWnd* wnd , HWND hWnd, WORD fPrintArea)

{

HBITMAP hBitmap = NULL; // handle to device-dependent bitmap

// check for a valid window handle

if (!hWnd)

return NULL;

RECT rectWnd;

::GetWindowRect(hWnd, &rectWnd);

switch (fPrintArea)

{

case PW_WINDOW: // copy entire window

{

// get the window rectangle

// get the bitmap of that window by calling

// CopyScreenToBitmap and passing it the window rect

// GetWindowRect(&rectWnd);

hBitmap = CopyScreenToBitmap(&rectWnd);

break;

}

case PW_CLIENT: // copy client area

{

RECT rectClient;

POINT pt1, pt2; // get client dimensions

wnd->GetClientRect(&rectClient); // convert client coords to screen coords

pt1.x = rectClient.left;

pt1.y = rectClient.top;

pt2.x = rectClient.right;

pt2.y = rectClient.bottom;

wnd->ClientToScreen(&pt1);

wnd->ClientToScreen(&pt2);

rectClient.left = pt1.x;

rectClient.top = pt1.y;

rectClient.right = pt2.x;

rectClient.bottom = pt2.y;

// get the bitmap of the client area by calling

// CopyScreenToBitmap and passing it the client rect

hBitmap = CopyScreenToBitmap(&rectClient);

break;

}

default: // invalid print area

return NULL;

} // return handle to the bitmap

return hBitmap;

}A good usage is :

Code:

HBITMAP hBitmap = CopyWindowToBitmap(this,GetDesktopWindow()->m_hWnd,PW_

1：拷贝屏幕DC成为位图句柄

HBITMAP CopyDCToBitmap(HDC hScrDC, LPRECT lpRect)

{

if(hScrDC==NULL || lpRect==NULL || IsRectEmpty(lpRect))

{

AfxMessageBox("参数错误");

return NULL;

}

HDC hMemDC;

// 屏幕和内存设备描述表

HBITMAP hBitmap,hOldBitmap;

// 位图句柄

int nX, nY, nX2, nY2;

// 选定区域坐标

int nWidth, nHeight;

// 位图宽度和高度

// 确保选定区域不为空矩形

if (IsRectEmpty(lpRect))

return NULL;

// 获得选定区域坐标

nX = lpRect->left;

nY = lpRect->top;

nX2 = lpRect->right;

nY2 = lpRect->bottom;

nWidth = nX2 - nX;

nHeight = nY2 - nY;

//为指定设备描述表创建兼容的内存设备描述表

hMemDC = CreateCompatibleDC(hScrDC);

// 创建一个与指定设备描述表兼容的位图

hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

// 把新位图选到内存设备描述表中

hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

// 把屏幕设备描述表拷贝到内存设备描述表中

StretchBlt(hMemDC,0,0,nWidth,nHeight,hScrDC,nX,nY,nWidth,nHeight,SRCCOPY);

//BitBlt(hMemDC, 0, 0, nWidth, nHeight,hScrDC, nX, nY, SRCCOPY);

//得到屏幕位图的句柄

hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);

//清除

DeleteDC(hMemDC);

DeleteObject(hOldBitmap);

// 返回位图句柄

return hBitmap;

}

//把HBITMAP保存成位图

BOOL SaveBmp(HBITMAP hBitmap, CString FileName)

{

if(hBitmap==NULL || FileName.IsEmpty())

{

AfxMessageBox("参数错误");

return false;

}

2：拷贝屏幕DC包成为BMP格式的文件 ;

//当前分辨率下每象素所占字节数

int iBits;

//位图中每象素所占字节数

WORD wBitCount;

//定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数

DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;

//位图属性结构

BITMAP Bitmap;

//位图文件头结构

BITMAPFILEHEADER bmfHdr;

//位图信息头结构

BITMAPINFOHEADER bi;

//指向位图信息头结构

LPBITMAPINFOHEADER lpbi;

//定义文件，分配内存句柄，调色板句柄

HANDLE fh, hDib, hPal,hOldPal=NULL;

//计算位图文件每个像素所占字节数

hDC = CreateDC("DISPLAY", NULL, NULL, NULL);

iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);

DeleteDC(hDC);

if (iBits <= 1) wBitCount = 1;

else if (iBits <= 4) wBitCount = 4;

else if (iBits <= 8) wBitCount = 8;

else wBitCount = 24;

GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap);

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = Bitmap.bmWidth;

bi.biHeight = Bitmap.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = wBitCount;

bi.biCompression = BI_RGB;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrImportant = 0;

bi.biClrUsed = 0;

dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;

//为位图内容分配内存

hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));

lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);

*lpbi = bi;

// 处理调色板

hPal = GetStockObject(DEFAULT_PALETTE);

if (hPal)

{

hDC = ::GetDC(NULL);

hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);

RealizePalette(hDC);

}

// 获取该调色板下新的像素值

GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)

+dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);

//恢复调色板

if (hOldPal)

{

::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);

RealizePalette(hDC);

::ReleaseDC(NULL, hDC);

}

//创建位图文件

fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,

FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);

if (fh == INVALID_HANDLE_VALUE) return FALSE;

// 设置位图文件头

bmfHdr.bfType = 0x4D42; // "BM"

dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;

bmfHdr.bfSize = dwDIBSize;

bmfHdr.bfReserved1 = 0;

bmfHdr.bfReserved2 = 0;

bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) + dwPaletteSize;

// 写入位图文件头

WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);

// 写入位图文件其余内容

WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);

//清除

GlobalUnlock(hDib);

GlobalFree(hDib);

CloseHandle(fh);

return TRUE;

}

int Engine_2D::SaveBitmapToFile(HBITMAP hBitmap, LPCWSTR lpFileName) //hBitmap 为刚才的屏幕位图句柄

{

//lpFileName 为位图文件名

HDC hDC;

//设备描述表

int iBits;

//当前显示分辨率下每个像素所占字节数

WORD wBitCount;

//位图中每个像素所占字节数

//定义调色板大小， 位图中像素字节大小 ， 位图文件大小 ， 写入文件字节数

DWORD dwPaletteSize=0,dwBmBitsSize,dwDIBSize, dwWritten;

BITMAP Bitmap;

//位图属性结构

BITMAPFILEHEADER bmfHdr;

//位图文件头结构

BITMAPINFOHEADER bi;

//位图信息头结构

LPBITMAPINFOHEADER lpbi;

//指向位图信息头结构

HANDLE fh, hDib, hPal;

HPALETTE hOldPal=NULL;

//定义文件，分配内存句柄，调色板句柄

//计算位图文件每个像素所占字节数

hDC = CreateDC(L"DISPLAY",NULL,NULL,NULL);

iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);

DeleteDC(hDC);

if (iBits <= 1)

wBitCount = 1;

else if (iBits <= 4)

wBitCount = 4;

else if (iBits <= 8)

wBitCount = 8;

else if (iBits <= 16)

wBitCount = 16;

else if (iBits <= 24)

wBitCount = 24;

else

wBitCount = 32;

//计算调色板大小

if(wBitCount <= 8)

dwPaletteSize=(1<<wBitCount)*sizeof(RGBQUAD);

//设置位图信息头结构

GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = Bitmap.bmWidth;

bi.biHeight = Bitmap.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = wBitCount;

bi.biCompression = BI_RGB;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrUsed = 0;

bi.biClrImportant = 0;

dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;

//为位图内容分配内存

hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));

lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);

*lpbi = bi;

// 处理调色板

hPal = GetStockObject(DEFAULT_PALETTE);

if (hPal)

{

hDC = GetDC(NULL);

hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE);

RealizePalette(hDC);

}

// 获取该调色板下新的像素值

GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);

//恢复调色板

if (hOldPal)

{

SelectPalette(hDC, hOldPal, TRUE);

RealizePalette(hDC);

ReleaseDC(NULL, hDC);

}

//创建位图文件

fh=CreateFile(lpFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);

if (fh==INVALID_HANDLE_VALUE)

return FALSE;

// 设置位图文件头

bmfHdr.bfType = 0x4D42; // "BM"

dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;

bmfHdr.bfSize = dwDIBSize;

bmfHdr.bfReserved1 = 0;

bmfHdr.bfReserved2 = 0;

bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;

// 写入位图文件头

WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);

// 写入位图文件其余内容

WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);

//清除

GlobalUnlock(hDib);

GlobalFree(hDib);

CloseHandle(fh);

return TRUE;

}

3创建WINCE下16位格式位图实现快速BitBlt

在WINCE下，如果创建的位图与屏幕设备格式不一样，将会导致BitBlt函数极为缓慢，因此需要创建一幅16位色565格式位图，用此方法创建出的位图可以提供1ms的快速BitBlt绘制。当然，如果设备不是565颜色格式的，更改代码中的颜色掩码位bmiColors就可以了。

/////////////////////////////////////////////////////////////////////////

/// @brief 创建一幅缓存图像。

/// @param[out] pHBitmap 生成的位图句柄。

/// @param[out] pData 生成的位图中的数据位置。

/// @param[in] hDC 目标DC句柄。

/// @param[in] width 位图宽度。

/// @param[in] height 位图高度。

/// @param[in] bitCount 每个像素占多少个bit。

/// @attention 创建的位图是无压缩格式的。

/// @author Loongee

/// @date 2010/01/15

//////////////////////////////////////////////////////////////////////////

void CreateBufferBitmap(HBITMAP*
pHBitmap, void** pData,

HDC hDC, LONG width,
LONG height,
WORD bitCount)

{

BITMAPINFO& bmpInfo = *(BITMAPINFO*)new
BYTE[sizeof(bmpInfo)
+ sizeof(RGBQUAD) * 3];

bmpInfo.bmiHeader.biSize =
sizeof(BITMAPINFOHEADER);

bmpInfo.bmiHeader.biWidth = width;

bmpInfo.bmiHeader.biHeight = height;

bmpInfo.bmiHeader.biPlanes = 1;

bmpInfo.bmiHeader.biBitCount = bitCount;

if (bitCount == 16)

{

bmpInfo.bmiHeader.biCompression = BI_BITFIELDS;

*(DWORD *)(&bmpInfo.bmiColors[0]) = 0xF800;

*(DWORD *)(&bmpInfo.bmiColors[1]) = 0x07E0;

*(DWORD *)(&bmpInfo.bmiColors[2]) = 0x001F;

}

else

{

bmpInfo.bmiHeader.biCompression = BI_RGB;

}

bmpInfo.bmiHeader.biSizeImage = 0;

bmpInfo.bmiHeader.biXPelsPerMeter = 1000;

bmpInfo.bmiHeader.biYPelsPerMeter = 1000;

bmpInfo.bmiHeader.biClrUsed = 0;

bmpInfo.bmiHeader.biClrImportant = 0;

*pHBitmap = CreateDIBSection(hDC, &bmpInfo, DIB_RGB_COLORS

, pData, NULL, 0);

delete[] (BYTE*)&bmpInfo;

}

待续。。。。。。。